<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card class="box-card">
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!--角色列表区域-->
      <el-table :data="roleList" border stripe>
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom','vcenter',i1 === 0 ? 'bdtop':'']" v-for="(item1,i1) in scope.row.children"
                    :key="item1.id">
              <!--渲染一级权限-->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!--渲染二级权限和三级权限-->
              <el-col :span="19">
                <el-row :class="[i2 === 0 ? '':'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3,i3) in item2.children" :key="item3.id" closable
                            @close="removeRightById(scope.row,item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
            <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
            <el-button type="warning" size="mini" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限
            </el-button>
          </template>
        </el-table-column>

      </el-table>
    </el-card>
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed">
      <el-tree ref="treeRef" :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all
               :default-checked-keys="defKeys"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: 'Roles',
    data() {
      return {
        //所有角色列表数据
        roleList: [],
        //控制分配权限对话框的显示与隐藏
        setRightDialogVisible: false,
        //所有权限数据
        rightslist: [],
        treeProps: {
          children: 'children',
          label: 'authName'
        },
        //默认选中的节点ID数组
        defKeys: [],
        //当前即将分配权限的角色ID
        roleId: ''
      }
    },
    created() {
      this.getRolesList()
    },
    methods: {
      //获取所有角色的列表
      async getRolesList() {
        const { data: res } = await this.$http.get('roles')
        if (res.meta.status !== 200) {
          return this.$message.error('获取列表失败')
        }
        console.log(res)
        this.roleList = res.data
      },
      //根据ID删除对应的权限
      async removeRightById(role, rightId) {
        const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if (confirmResult !== 'confirm') {
          return this.$message.info('取消了删除')
        }
        const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除权限失败')
        }
        role.children = res.data
      },
      //展示权限分配的Dialog
      async showSetRightDialog(role) {
        this.roleId = role.id
        //获取所有权限的数据
        const { data: res } = await this.$http.get('rights/tree')
        if (res.meta.status !== 200) {
          return this.$message.error('获取权限数据失败')
        }
        this.rightslist = res.data
        console.log(this.rightslist)
        //获取该角色三级权限的ID获取出来
        this.getLeafKeys(role, this.defKeys)
        this.setRightDialogVisible = true
      },
      //通过递归的形式，获取角色下所有三级权限的id,并保存到defKeys数组中
      getLeafKeys(node, arr) {
        //如果当前节点不包含children属性，则是三级节点
        if (!node.children) {
          return arr.push(node.id)
        }
        node.children.filter(item => this.getLeafKeys(item, arr))
      },
      setRightDialogClosed() {
        this.defKeys = []
      },
      //为角色分配权限
      async allotRights() {
        const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
        console.log(keys)
        const idStr = keys.join(',')
        const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
        if (res.meta.status !== 200) {
          return this.$message.error('获取权限数据失败')
        }
        this.$message.success('分配权限成功！')
        this.getRolesList()
        this.setRightDialogVisible = false
      }
    }
  }
</script>

<style scoped lang="less">
  .el-tag {
    margin: 7px;
  }

  .bdtop {
    border-top: 1px solid #eee
  }

  .bdbottom {
    border-bottom: 1px solid #eee;;
  }

  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
